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5 Check Harness and Connector (Mass Air Flow Sensor - Efi Relay)

The document provides diagnostics instructions for checking the SFI system on a 2004 Corolla. It involves 3 steps: 1. Checking the harness and connector for the mass air flow sensor and EFI relay for open or short circuits. 2. Inspecting the ECM power source circuit by checking resistance between terminals on the ECM connector is below 1 ohm. 3. If resistance is not within specification, replace the ECM.

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Clodoaldo Biassio
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64 views1 page

5 Check Harness and Connector (Mass Air Flow Sensor - Efi Relay)

The document provides diagnostics instructions for checking the SFI system on a 2004 Corolla. It involves 3 steps: 1. Checking the harness and connector for the mass air flow sensor and EFI relay for open or short circuits. 2. Inspecting the ECM power source circuit by checking resistance between terminals on the ECM connector is below 1 ohm. 3. If resistance is not within specification, replace the ECM.

Uploaded by

Clodoaldo Biassio
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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05–70

DIAGNOSTICS – SFI SYSTEM (April, 2003)

5 CHECK HARNESS AND CONNECTOR(MASS AIR FLOW SENSOR – EFI RELAY)

Engine Room R/B: (a) Remove the EFI relay from the engine room R/B.
(b) Disconnect the M1 mass air flow sensor connector.
(c) Check the resistance between the wire harness side con-
nectors.
Standard (Check for open):
Tester Connection Specified Condition
EFI Relay +B (M1–1) – EFI relay (3) Below 1 Ω
Standard (Check for short):
A65750 Tester Connection Specified Condition
+B (M1–1) or EFI relay (3) – Body ground 10 kΩ or higher
Wire Harness Side: (d) Reconnect the mass air flow sensor connector.
M1 (e) Reinstall the EFI relay.

+B
Mass Air Flow Sensor Connector NG REPAIR OR REPLACE HARNESS OR
A54396 CONNECTOR

OK

CHECK FOR ECM POWER SOURCE CIRCUIT (See page 05–273)

6 INSPECT ECM(SENSOR GROUND)

(a) Check the resistance between the terminals of the E4


E4 ECM connector.
Standard:
Tester Connection Specified Condition
EVG (E4–32) – Body ground Below 1 Ω

EVG
ECM Connector A18294 NG REPLACE ECM (See page 10–11)

OK

2004 COROLLA (RM1037U)

Author: Date: 235

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